Point Importing

[Malcolm Williamson]

Hi, Taravudh
As these points really represent vertices of a polygon, rather than 
sites, the ASCII file needs to be imported using v.in.ascii. Check the 
manual pages for format specifics; I recommend using v.out.ascii on an 
existing vector file so that you can see the expected file format. 

I don't have GRASS handy at the moment, and I don't recall the header 
format, but the basic structure for the coordinate part is as follows:
(let's assume there are 8 coordinates)

A 9
 x-coordinate1 y-coordinate1
 x-coordinate2 y-coordinate2
 x-coordinate3 y-coordinate3
 x-coordinate4 y-coordinate4
 x-coordinate5 y-coordinate5
 x-coordinate6 y-coordinate6
 x-coordinate7 y-coordinate7
 x-coordinate8 y-coordinate8
 x-coordinate1 y-coordinate1

Note that the first and last coordinate pair are the same. Also, I may 
have my x- and y-coordinates reversed; please check the manual. After 
importing this file with v.in.ascii, you'll need to run v.support. After 
that, you can label the polygon in v.digit if desired.

Regards,
	-Malcolm Williamson


On Tue, 20 Oct 1998, taravudh wrote:

> Hi All,
> 
> How to combine sites that were converted from ascii files by using
> s.in.ascii ?  The ascii files received from GPS data that I used it to
> locate flood boundary. The example below is details.
> 
>         x
>     x        x
>     x          x
>         x        x
>     x              x
>     x            x
>         x    x
>            x
> 
> Anyway, I'd like to know how to combine them after I used s.in ascii.
> 
> Thank you very much
> Taravudh..
> 
> 
>